# NGK vs Bosch Spark Plugs

**URL:** <https://forums.speedlife.net/t/ngk-vs-bosch-spark-plugs/23194>\
**Category:** NYSpeed Automotive\
**Created:** [January 17, 2007, 3:11pm UTC](https://forums.speedlife.net/t/ngk-vs-bosch-spark-plugs/23194 "2007-01-17T15:11:16Z")\
**Posts on this page:** 1\
**Showing post:** 24

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**Author:** ![9ONA3OOZX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/9ona3oozx/32/7242_2.png) [@9ONA3OOZX](https://forums.speedlife.net/u/9ONA3OOZX)\
**Post date:** [January 18, 2007, 8:02am UTC](https://forums.speedlife.net/t/ngk-vs-bosch-spark-plugs/23194/24 "2007-01-18T08:02:32Z")

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[http://czp.us/Cart/description.php?II=1163&Car\_Type=300&UID=20070118085714138.92.55.220](http://czp.us/Cart/description.php?II=1163&Car_Type=300&UID=20070118085714138.92.55.220)

**NGK 300ZX Iridium Spark Plugs**** Code: **300-2667\_8\_9** Name: **NGK 300ZX Iridium Spark Plugs** Price: **$60.00** Description:** Stock Boost Levels up to 15 psi: Stock Plug PFR6B-11B, Smooth Daily Driver “7” Heat Range: Stock Turbos (15+ PSI level), Sport 500s. 530s, & 600s. Great for street use.

“8” Heat Range: For those who race at high boost levels and any upgraded turbochargers. Good for nitrous as well. Great for street use.

“9” Heat Range: Race use only! Great for high boost and nitrous use. Not recommended for daily driving.

**Set of 6 included**

> [@psphinx81](#):
>
> r u kidding andy?
> 
> no wonders ur car runs like ass lol

Concept Z’s 300ZX Knowledge \> mine \> yours…so i think i’ll listen to what they have to say about which plugs to use. If they do end up having a short lifespan, then i’ll prob stick with coppers…but until that happens, i’m taking the advice of the pro’s on Z’s.

I ran coppers all last summer on stock boost, and it didn’t run as bad as you think (but yes, it could have run better)…this year i will not be running stock boost…and so, i’m going to be running iridium’s…getting one step colder than stock as well…just incase i plan on running more than 15psi…which i eventually do.

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